Guard for power presses



. I. E. PHlLLIPS.

GUARD FOR POWER PRESSES'.

APPLICATION FILED JUNE 28, 1921.

Patented June 6,1922.

WVZ/Vm? iv in 1. 0. 101 205 A ffdZ/Vi/S raisin st JOHN EnwrN rHILLrrs; or BIRMINGHAM, ENGLAND.

' GUARD EO'RPOWER PR ESSES.

in Guards for Power Presses, of which the following is a specification.

This invention relates-to guards for power presses, and particularly to guardsof that type comprising a collapsible lazy-tong frame or frames adapted to be extended during the down or working stroke of the press plunger and prevent injury to the hand of the operator.

It has already been proposed in guards of the above type automatically to effect both the collapsing and extending of the lazytong frames by a moving part of the press, such as the press plunger, but according to the present invention the guard frame or frames are only extended by a moving part of the press, it being proposed to effect the collapsing of the frame or frames by means of a spring. The guard frame or frames are preferably extended by means of a Bowden wire connected either to the press plunger or to some other moving part of the press. No such arrangement has hitherto been proposed.

Figure 1 represents an elevational view showing an arrangement in which the guard is operated by a Bowden wire, the latter being actuated by a lever against which a part upon the press plunger strikes; Two guard frames are shown, but if desired a single, frame only may be employed.

Figure 2 shows an alternative method of operating the Bowden wire, the latter being .actuated by a cam upon the crank shaft of the press.

Figure 3 is a cross seotion on the line 00 Figure 2.

The same reference numerals indicate cor responding parts in each of the figures.

Referring to the drawings, the guard comprises two lazy-tong frames 1 mounted upon the axial rod 5, and connected at their upper inner ends to a sliding sleeve, the guard frames being automatically collapsed by the coiled spring 9. The one end of the Bowden-wire 29 is attached to the front plate 19 carried by an integral collar upon the upper end of the sleeve member. the respective end of the outer casing 30 of the wire being arranged to abut against a fixed stop 31 through which the wire passes, the

Specification of Letters Patent. Patented. June fi, 1:922,

Application filed 311116 28; 1521. Serial No; 481,015.

said stop} being preferably carried bythe bracket upon the bed of the press, as shown;

The opposite end of" the wire 29 passesaxially through an 1 adjusting screw 32 carpress: frame 34, at one side of the plunger,

the extremities of th'e wire beingfi'xed to the outerend'ofalever 3' 5- pivoted at 36 bracket 33- The respective end 'of th'e casing 3O 'ofth-e wire-is-arranged to abut again st the head of'the adjusting screw 32, as shown. The lever 35 is arranged normally in a substantially horizontal position, and carries a roller 37 at its inner end which is adapted to be engaged by a block or striker 38 fixed upon the plunger 39 of the press. The ar rangement is such that on the down stroke of the plunger 39 the block or striker 38 strikes against the roller 37 upon the lever 35 and forces the said end downwards, so that the opposite end of the lever 35 which is connected to the end of the Bowden wire 29 is raised. The wire 29 is thus drawn through its casing 30, its opposite end moving the plate 19 to which it is attached downwards, so that the integral collar carrying the said plate, actu ates upon the upper inner ends of the frames 1, the ends of the latter moving down upon the vertical rod 5, so that the spring 9 upon the said rod is compressed and the guard frames 1 extended. During the upward stroke of the press plunger the block or striker 38 upon the latter is moved out of engagement with the roller 37 upon the lever 35 so that the latter assumes its original position, and the guard frames 1 are automatically collapsed by the coiled spring 9.

Referring to the modification shown in Figures 2 and 3, instead of the lever 35 operating the Bowden wire 29 being actuated by means of a member upon the press plunger, as above described, it may be actuated by means of a suitably shaped cam 40 upon the crank shaft 41 of the press, the I may be employed if desired, the Wire being arranged to pass over suitable pulleys or I through guides.

The guard may either consist of a single lazy-tong frame or of a pair of frames, as

to extend the guard during the power stroke of the plunger, and a coiled spring for auto matically collapsingthe guard on the return stroke of the plunger.

2. A press-guard comprising a collapsible and extensible frame, acable operatively connected at one end to the said frame, a

lever connected to the opposite end of the cable and operated by a moving part of the press, and a coiled spring for automatically collapsingthe guard on the return stroke of the plunger.

3. A press-guard comprising a collapsible and extensible frame, a cable operatively connected at one end to the said frame, a lever connected to the opposite end of the cable, a cam operating the said lever and actuated by the crank shaft of the press, and a coiled spring for automatically collapsing the guard on the return stroke of the plunger. V

In testimony whereof I have hereunto set my hand'in presence of two subscribing Witnesses.

7 JOHN EDWIN PHILLIPS. Witnesses:

HENRY NORTON SKERRETT, WV. S. SKERRETT. I 

